The effect of heat input on residual stress distribution of steel welds measured by neutron diffraction

• Autorzy: Paradowska A. M. , Price J. W. H. , Ibrahim R. , Finlayson T. R.
• Języki publikacji: EN

Abstrakty

EN

Purpose: of this paper is to investigate the effect of increase in the value of heat input due to change in the welding speed and its influence on residual stress distribution in steel weldments. Design/methodology/approach: The use of the neutron diffraction (ND) technique for residual stress measurements is described. Fully restrained, single-bead-on-plate specimens have been examined. Detailed measurements within a small gauge volume were taken 1.5 mm below the surface, across the sample. In addition, studies of macrostructure and hardness were conducted. Findings: Residual stresses in restrained welds and weld repairs are very complex. The heat input affects the value and distribution of residual stress in the specimen. This peak stress in all three samples occurred not at the toe, but in the middle of the weld bead, where the yield stress is higher. The transverse residual stresses of around half the maximum value of longitudinal stress have been observed. Research limitations/implications: Measurements of residual stress can be very expensive and time consuming. The ND technique is capable of non-destructive investigation in a relatively small gauge volume in depth of the material. However, a number of important issues still remain puzzling, including the uncertainties in the measurement, reliability and interpretation of the results, particularly in regards to the sampling volume and generally in the lack of an engineering standard procedure. The results may be used to calibrate finite element modelling of the welding process. Practical implications: The findings have important consequences with respect to design of welding procedures and fitness-for-purpose assessments. Originality/value: The authors have used ND assessment of residual stresses to follow in detail the changes due to heat input in a small gauge volume. This paper could be an interesting source of information for engineers and researchers who work with welded structures

Słowa kluczowe

EN

welding; residual stress; neutron diffraction; heat input

PL

spawanie; naprężenia własne; dyfrakcja neutronowa; dopływ ciepła

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 17, nr 1-2
• Strony: 385--388
• Opis fizyczny: Bibliogr. 11 poz., rys., tab., wykr.

Twórcy

autor

Paradowska A. M.

• Mechanical Engineering Department, Monash University, Victoria 3800, Australia

autor

Price J. W. H.

• Mechanical Engineering Department, Monash University, Victoria 3800, Australia

autor

Ibrahim R.

• Mechanical Engineering Department, Monash University, Victoria 3800, Australia

autor

Finlayson T. R.

• School of Physics, Monash University, Victoria 3800, Australia

Bibliografia

• [1] P.J. Withers, H.K. Bhadeshia: Residual Stress - I: Measurement Techniques, Materials Science & Techn., 17 (2001) 355-365.
• [2] P.J. Withers, H.K. Bhadeshia: Residual Stress - II: Nature and Origins, Materials Science & Techn., 17 (2001) 366-375.
• [3] P. Sedek, J, Brozda, L. Wang, P.J. Withers, Residual stress relief in MAG welded joints of dissimilar steels, International Journal of Pressure Vessels and Piping, 80, (2003) 705-713.
• [4] Xiaohua Cheng, J.W. Fisher, H. J. Prask, T. Gnäupel-Herold, B.T. Yen and Sougata Roy: Residual stress modification by post-weld treatment and its beneficial effect on fatigue strength of welded structures, International Journal of Fatigue, 25 (9-11), (2003) 1259-1269.
• [5] A. Bahadur, B.R. Kumar, A.S. Kumar, G.G. Sarkar, J.S. Rao: Development and comparison of residual stress measurement on welds by various methods, Materials Science and Technology, 20, (2004) 261-269.
• [6] W. Zinn, B. Scholtes: Residual Stress Formation Processes During Welding and Joining, Handbook of Residual Stress and Deformation of Steel, ASM Inter., (2002) 391-396.
• [7] Jae-il Jang, Dongil Son, Yun-Hee Lee, Yeol Choi and Dongil Kwon, Assessing welding residual stress in A335 P12 steel welds before and after stress-relaxation annealing through instrumented indentation technique, Scripta Materialia, 48 (6), 2003, 743-748.
• [8] R.A. Owen, R.V. Preston, P.J. Withers, H.R. Shercliff and P.J. Webster: Neutron and synchrotron measurements of residual strain in TIG welded aluminium alloy 2024, Materials Science and Engineering A, 346 (2003) 159-167.
• [9] M. Duquennoy, M. Ouaftouh, M.L. Qian, F. Jenot and M. Ourak: Ultrasonic characterization of residual stresses in steel rods using a laser line source and piezoelectric transducers, NDT & E International, 34(5), (2001) 355-362.
• [10] P. Dong, F.W. Brust: Welding Residual stresses and effects on fracture in pressure vessels and Piping Components: A millennium Review and Beyond, Journal of Pressure Vessel Technology, 122, (2000) 329-338.
• [11] AS/NZS 3678:1996.Grade 250, Structural steel-hot-rolled plates, floor plates and slabs.